Captive biter spawners produce eggs that match their quality. Higher quality eggs take longer to produce so all eggs are produced at a rate of 5 every 10 seconds.

Notes

• Eggs will start off as normal quality before being upgraded on a 10-second cycle, so you should filter your inserters to extract eggs at the desired quality.
• Since this is done via scripting rather than modifying the prototypes and associated recipes, the production interface in the spawner won't reflect the modded production.
• Due to limitations in scripting, eggs will spoil in the spawners. This shouldn't be a problem however, as the entire inventory (up to the normal maximum of 100) is refreshed every 10 seconds, resetting the spoilage timer.
• Capture bot rockets still don't grant higher quality to wild nests: to build high quality spawners you'll need the 'Captive biter spawner' research from Aquilo.
• Thanks to ChatGPT for doing a lot of the coding grunt-work.